mull vs cerebrate

mull is a noun but cerebrate is not a noun.

Word	Noun	Adjective	Verb	Adverb
mull	Yes	No	Yes	No
cerebrate	No	No	Yes	No

As verbs, cerebrate is a hypernym of mull; that is, cerebrate is a word with a broader meaning than mull:

mull: reflect deeply on a subject
cerebrate: use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

Other hypernyms of mull include cogitate, think.

mull (noun)	cerebrate (noun)
a term used in Scottish names of promontories

mull (verb)	cerebrate (verb)
reflect deeply on a subject	use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments
heat with sugar and spices to make a hot drink